Action script

[Cyro]

ok here's the thing. I'm simulating ECG (electrocardiogram) and I get a set of numbers ranging from -1 to 1. In adapter I send ONLY that value. No timestamp or anything. Value is generated (read from file or outside source) every 0.01 second. I managed to accept the data and I get it. But now I need to plot that line so that we can see how nice our heart beats. The thing is - bandwith is not a problem - since we're using our own servers and network (very powerfull - My college works with Ericsson ) with very high capped bandwith. I got evaluation version of Lightstreamer Vivace. This project I'm working on will be long past done by the time license expires. And when I present the results decision will be made about buying the license.

Anyway I got carried away... I used the source from number 1 in your earlier post and copied the part which uses the graph. Problem is graph recieves two parameters. Timestamp on X axis and price on Y. Y axis is trivial since I just use the value I get but as for X axis I don't have timestamp... And I don't use schema as well. I just get one value so there's no sense in using schema for that. (I changed the range of X axis to 120 seconds since that is the amount of data we have. And Y axis is between -2 and 2 just so we have some breathing space)

[Cyro]

p.s. I would use Flex since it looks better but I don't even know where to start with it since I'm a total stranger. I understand a little from your example but that's far from anything usable.

[Cyro]

p.s. I would use Flex since it looks better but I don't even know where to start with it since I'm a total stranger. I understand a little from your example but that's far from anything usable.

[Mone]

ok, you can certainly add your timestamp client-side, in the ChartDemo you can see that the chart is based on fields 3 and 4 (setXAxis & setYAxis calls) but the subscribed table has only two fields: fields 3 and 4 are calculated client side and added to the table through addField calls;

Btw in case of a timestamp, I advise you to generate it server side to keep your data coherent: the timestamp related to the received data should be the timestamp the data was generated, not the timestamp the data was received&processed (e.g.: imagine your client running on a slow connection or two different clients subscribed to the same data but one client on a speedy machine while the other on a slow machine).

[Cyro]

I've added the line to push timestamp on the adapter but I still get only the value for presentation. Here's the code part:

Map<String,String> data = new HashMap<String,String>();
try {Reader r = new BufferedReader(new FileReader("C:\\primjer.txt"));
StreamTokenizer stok = new StreamTokenizer(r);
stok.parseNumbers();
// double sum = 0;
stok.nextToken();
while (stok.ttype != StreamTokenizer.TT_EOF) {
if (stok.ttype == StreamTokenizer.TT_NUMBER)
i++;
if(i%3==2){
data.put("timestamp", (new Date()).toString());
data.put("Next", Double.toString(stok.nval));
listener.update(item, data, false);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
}
stok.nextToken();
}
stok.nextToken();

That part of code is in while loop. Now... The problem is that timestamp seems not to be sent. I get only Next. And if I changed that what do I have to add to client so that even timestamp gets shown in table? (Do I need schema or group?)

[Cyro]

and I got one new idea. I changed the timestamp above into float value that increases by 0.01 and represents time since beggining of stream. I believe I can use it as X axis. But I cannot accept it and show it as time in table on client side. I just get "Next".

[Mone]

first of all, sorry if I didn't notice it before, but I see that you're reusing the same map for each update.
This is not supported, please check the ItemEventListener class description.

At a first look the rest of the code seems ok, maybe you used the wrong name client side.

You can send any string through Lightstreamer, but, as long as you plot your chart with our ChartTable, any value on the axis must be a number. You can easily convert your date client-side as we do on the ChartDemo. Don't know about adobe chart libraries.

[Cyro]

nvm I got it to work and on the other side I get this something like this:

time Value
0.010 -0.020
0.020 -0.025
0.030 -0.010
0.040 -0.010
0.050 -0.015
0.060 -0.010
0.070 -0.020
0.080 -0.025
0.090 -0.040
0.100 -0.035
0.110 -0.055
0.120 -0.040
0.130 -0.055
0.140 -0.055
0.150 -0.045
0.160 0.005
0.170 0.030
0.180 0.060
0.190 0.055
0.200 0.120
0.210 0.085
0.220 0.055
0.230 -0.010
0.240 -0.005
0.250 -0.090
0.260 -0.095

(the values overwrite! but this is just example in which way they go.

Anyway - time is advancing 0.01 and value is erratic. I need to plot it in HTML. But I don't even get peep from that part of code. Here's client. (First part works perfectly but problem is with graph.

<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></meta>
<script language="JavaScript" src="LS/lscommons.js"></script>
<script language="JavaScript" src="LS/lspushpage.js"></script>
</head>

<body>
<h1>Simplest</h1>
<table width="440" cellspacing="0" cellpadding="2" border="0">
<tr class="titolClass">
<td width="150">
<p style="text-align: left">Value</td>
<td width="80">Time<br><span style="font-size: 7pt"></span></td>


</tr>
<tr>
<td nowrap class="greyClass"><div class="nameClass1" source="lightstreamer" table="table1" item="Next" field="Next">Loading</div></td>
<td class="greyClass"><div class="greyClass" source="lightstreamer" table="table1" item="Next" field="timestamp">Loading</div></td>
</tr>





<script>



/////////////////PushPage Configuration

var schemaTable = ["timestamp", "Next"];
var schemaChart = ["Next", "timestamp"];
var group = ["Next"];

var lsPage = new PushPage();
var debugAlerts = false;
var remoteAlerts = false;
var pushHost = null;
var pushPort = null;
var useDomain = null;

lsPage.context.setDomain(useDomain);
lsPage.context.setDebugAlertsOnClientError(debugAl erts);
lsPage.context.setRemoteAlertsOnClientError(remote Alerts);

lsPage.onEngineCreation = function(lsEngine) {
lsEngine.context.setDebugAlertsOnClientError(debug Alerts);
lsEngine.context.setRemoteAlertsOnClientError(remo teAlerts);

lsEngine.connection.setLSHost(pushHost);
lsEngine.connection.setLSPort(pushPort);
lsEngine.connection.setAdapterName("SIMPLEST");

lsEngine.changeStatus("STREAMING");
}

lsPage.bind();
lsPage.createEngine("SimplestEng","LS","SHARE_SESS ION");

///////////////////////Table configuration



var table1 = new OverwriteTable(group, schemaTable, "MERGE");
table1.setClearOnDisconnected(true);
table1.setClearOnRemove(true);
lsPage.addTable(table1, "table1");

var lines = {};
var gTable = new ChartTable(group, schemaChart, "MERGE");
gTable.setSnapshotRequired(false);
gTable.setAreaClass("lsgbox");
gTable.setAreaWidth(1200);
gTable.setAreaHeight(300);
gTable.setAreaLeft(40);
gTable.onItemUpdate = onChartUpdate;
gTable.setClearOnRemove(true);
gTable.setClearOnDisconnected(false);
gTable.setClearOnAdd(false);

function onChartUpdate(item, upOb) {
var sec = upOb.getNewValue(table1);
var prc = upOb.getNewValue(table1);


}
</script>
</body>

</html>

[Mone]

you removed too much from the ChartDemo.

You need a piece of html, where the chart will be appended:
<div table="graph" source="lightstreamer"/>

and you miss some javascript that adds the table to the PushPage, and configures the axis and the chart line (you should remove your onChartUpdate function)
//you should tell to the ChartTable which field you want to plot on the x axis<br /> //I'm assuming that timestamp is formatted as a number server-side<br /> gTable.setXAxis("timestamp", false);<br /> //and you should give a min and max to it<br /> gTable.positionXAxis(0, 1);<br /> <br /> //you forgot to subscribe<br /> pushPage.addTable(gTable,"graph");<br /> <br /> var chartLine = null;<br /> function onChartUpdate(item, upOb) {<br /> if (!chartLine) {<br /> chartLine = new ChartLine();<br /> chartLine.setPointClass("lspxbig");<br /> chartLine.setLineClass("lspx");<br /> //you should tell to the ChartLine which field you want to plot on the y axis<br /> chartLine.setYAxis(item,"Next",false);<br /> //and you should give a min and max to it<br /> chartLine.positionYAxis(-0.2,0.2);<br /> <br /> gTable.addLine(chartLine,"anyId");<br /> }<br /> }

finally you need some CSS classes (that maybe you already have) like those:
.lspx {<br /> width:1px; <br /> height:1px; <br /> background-color: black;<br /> }<br /> .lspxbig {<br /> width:1px; <br /> height:1px; <br /> background-color: black;<br /> }<br /> .lsgbox {<br /> background: yellow;<br /> }

I think that's all

[Cyro]

I've done what you said but still have nothing. Firebug found error on

pushpage.addtable(gTable,"graph");

so I changed it to the already defined lsPage. Now I don't get error but neither do I get anything beyond those two columns.